XS sounds like excess, B4 sounds like before, XLNC sounds like excellency, etc. What are these wordplays called?
After some googling, I found the term grammagram referring to this type of wordplay. While not as common/official as rebus, this term is much more specific, since a rebus is usually mostly pictures, with few letters. It is an RL-coined (Richard Lederer) word, apparently (see this thefreelibrary entry), which, together with the comparative rarity of grammagrams themselves, would explain its uncommon status.
Personally, I'd use it, though rebus (or letter rebus) would be more widely understood.
That sort of wordplay is called a rebus.
protected by tchrist♦ May 30 '17 at 5:38
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?