Question

There should be a full stop at the end of a symbol for units.
A) True
B) False

Answer 1

Hint: There are various myths between the students whether to write or put a full stop after the symbols or not. A student goes from day to day readings from books and can know the truth by looking at the examples given in their textbook. For example 25 cm, this is how we write. Hence no full stop.

Complete step by step answer:
There are some specific ways to write physical entities and their units. It is important to remember where to put commas and full stops and spaces.
There are some conventions to write these symbols and their units.
Never apply or use a full stop after a unit symbol. If there is a room, leave some space between the number and the units
For example: $25 cm, 1000 kg, {37^0}C$ etc.

So the answer is (option B) false. We never put a full stop after the end of a symbol for units but give some space.

Additional information:
Always use italic type in superscripts and subscripts if they represent variables, quantities, or running numbers.
Units and symbols are not followed by a period unless at the end of a sentence.
For example:
The bar is $75 cm$ long. (correct)
The bar is $75 cm.$ long. (incorrect)
Only units of the SI and those units recognized for use with the SI are used to express the values of quantities. Equivalent values in other units are given in parentheses following values in acceptable units only.
Abbreviations such as sec, cc, or mps are avoided and only standard unit symbols, prefix symbols, unit names, and prefix names are used.
Example: s or second, $c{m^3}$ or cubic centimeter.
Units symbols are unaltered in the plural form
Example:
$l= 75 cm$ (correct)
$l= 75 cms$ (incorrect)

Note:
Students usually make mistakes in writing the units after the symbol. The symbol has no importance if it is written without a unit
For example 33, here it is not clear what is 33
Now, 33 km, here it is specified that we are talking about the kilometer and the value is 33.
Even in exams of mathematics, chemistry, physics, etc., the teachers are vigilant toward the writing style of units after symbols and always become a reason for marks deduction.