What is the meaning of Ksi?

Abbreviation of kilopound per square inch.

xi; the Greek letter Ξ (lowercase ξ)

xi (Greek letter)

xi (Greek letter Ξ, ξ)

to lift, to pick up

to take, to grab, to seize

to transport, to deport

to contain

to collect, to gather

to bring

Source: wiktionary.org