(sp?) Explanation: Only to indicate that you are unsure of the spelling.

How do you indicate unsure of spelling?

Usually someone uses sp? to mean spelling? to indicate that they are not sure how to spell a word.. In this case they were unsure if retiscent (reticent) was spelled corretly.

Is SP Short for spelling?

Typically, the abbreviation SP after a word - or sometimes just in the margin - stands for SPELLING. This means that the word that has been marked as SP has a spelling mistake. This can vary from a simple typing mistake, to an incorrect spelling or using the wrong form of a word.