silly walk = S = Silver Book

silo n.

The FIFO input-character buffer in an RS-232 line card. So called from DEC terminology used on DH and DZ line cards for the VAX and PDP-11, presumably because it was a storage space for fungible stuff that went in at the top and came out at the bottom.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.