Not really algebra, nor an anagram, but not really a rebus either. In a rebus, one uses pictures of sound-alikes to represent words. For example, a picture of an eye for "I", or a female sheep for "you", a baby goat for the first part of "kidding", etc. The pictures are usually drawings, but sometimes photos.
Here's a rebus-type birthday card I made for a young Judo student some years ago. Because it's for a little kid, I included text to be read aloud (to make it easier), but that's not typically done. This was a bright little girl, and she got it at once, except that she needed a little help pronouncing "ewes".
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-- Carl
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