Small rectangular chip with gull-wing leads on two sides. The W25Q128 is SOIC-8.
How it looks
Drawing: this is not on CORE3588, so it is drawn
A SOIC-8 from above and from the side. The W25Q128 flash memory on the Stamp board is one of these.
Real image: CORE3588, a close cousin (TSSOP), not a SOIC
Close cousin on CORE3588: the level shifter U10.
1U10 is a TSSOP-24, not a SOIC: same gull-wing legs, but thinner and much closer together (0.65 mm). Shown only so you can see the leg shape on a real board.
How it works
Where it fits
Bigger and friendlier than a QFN, smaller than a DIP. Its tiny relative is SOT-23. All of these are SMD / SMT parts.