You don’t need to use an apostrophe to show the plurals of symbols.
Examples: #s 1, 2, and 3 (numbers 1, 2, and 3)
$s, not €s (dollars, not euros)
For information on apostrophes with numbers, dates, and letters, click here.
Take an Online Quiz
Try an online Apostrophes Quiz and get your score and explanations instantly! Click here
Hundreds of Additional [...]

An inquisitive reader asked the following question:
When do you use on to vs. onto?
Answer: Use onto as one word if you can add up before on.
Example: He climbed (up) onto the roof.
Example: She held on to her child in the crowd. (She did not hold up her child.)
Click here to learn hundreds of distinctions [...]