Rebus
A rebus is a puzzle that represents a word or phrase using pictures, letters, numbers and their arrangement on the page, so that where the pieces sit is part of the message.
The name is Latin for "by things". ICU reads as I see you, and the word STAND written above the letter I reads as I understand. Position, size, repetition and orientation all carry meaning: a word printed twice can mean double or repeat, a word inside a box can mean in or boxed in, small type can mean little.
Rebuses predate literacy as a way of writing names in pictures, survive in heraldry as punning coats of arms, and live on in text-message spellings such as gr8 and l8r. Solving one is closer to reading a picture than to reasoning, which is why the answer usually arrives all at once.
American crossword constructors use the word for something narrower. A rebus square is a single cell that holds more than one letter, or a symbol standing for a word, in defiance of the one-letter-per-square rule — a theme device that hides in plain sight until the letter count refuses to work out.
Daily Riddle — the same appetite for a trick you can see once you know where to look.