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Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers in this system are represented by combinations of letters from the Latin alphabet. Modern usage employs seven symbols, each with a fixed integer value:

The use of Roman numerals continued long after the decline of the Roman Empire. From the 14th century on, Roman numerals began to be replaced by Arabic numerals; however, this process was gradual, and the use of Roman numerals persists in some applications to this day.

One place they are often seen is on clock faces. For instance, on the clock of Big Ben (designed in 1852), the hours from 1 to 12 are written as:

The notations IV and IX can be read as "one less than five" (4) and "one less than ten" (9), although there is a tradition favouring representation of "4" as "IIII" on Roman numeral clocks.

Other common uses include year numbers on monuments and buildings and copyright dates on the title screens of movies and television programs. MCM, signifying "a thousand, and a hundred less than another thousand", means 1900, so 1912 is written MCMXII. For the years of this century, MM indicates 2000. The current year is MMXXI (2021).

INFO: Full form for RN is Rule Name in Maths category
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In computing, a line number is a method used to specify a particular sequence of characters in a text file. The most common method of assigning numbers to lines is to assign every line a unique number, starting at 1 for the first line, and incrementing by 1 for each successive line.

In the C programming language the line number of a source code line is one greater number of new-line characters read or introduced up to that point.

Programmers could also assign line numbers to statements in older programming languages, such as Fortran, JOSS, and BASIC. In Fortran, not every statement needed a line number, and line numbers did not have to be in sequential order. The purpose of line numbers was for branching and for reference by formatting statements.

Both JOSS and BASIC made line numbers a required element of syntax. The primary reason for this is that most operating systems at the time lacked interactive text editors; since the programmer's interface was usually limited to a line editor, line numbers provided a mechanism by which specific lines in the source code could be referenced for editing, and by which the programmer could insert a new line at a specific point. Line numbers also provided a convenient means of distinguishing between code to be entered into the program and direct mode commands to be executed immediately when entered by the user (which do not have line numbers).

Largely due to the prevalence of interactive text editing in modern operating systems, line numbers are not a feature of most programming languages, even modern Fortran and Basic.

INFO: Full form for RN is Response Numerical in Maths category
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INFO: Full form for VDS is Very Detailed Statistics in Maths category
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INFO: Full form for GRASP is Generalized Regression Analysis and Spatial Prediction in Maths category
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INFO: Full form for GRASP is Graphical Representations of Algorithms Structures and Processes in Maths category
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INFO: Full form for GC is Generalized Center in Maths category
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INFO: Full form for APT is Adaptive Prediction Tree in Maths category
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INFO: Full form for APT is Almost Polynomial Time in Maths category
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INFO: Full form for ULL is Upper Linear Limit in Maths category
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INFO: Full form for PIF is Plot Implausibility Field in Maths category
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INFO: Full form for SAF is Simple Aggregation Format in Maths category
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INFO: Full form for RPT is Rushing Paper Time in Maths category
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INFO: Full form for RPT is Relative Prime Transform in Maths category
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INFO: Full form for RPT is Renormalized Perturbation Theory in Maths category
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INFO: Full form for DLL is Double Leading Logarithmic in Maths category
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INFO: Full form for AST is Accurate Sample Taking in Maths category
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INFO: Full form for AST is Angle Sum Theorem in Maths category
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