What does XL stand for?

XL stands for "X-axis of Spacelab"

How to abbreviate "X-axis of Spacelab"?

"X-axis of Spacelab" can be abbreviated as XL

What is the meaning of XL abbreviation?

The meaning of XL abbreviation is "X-axis of Spacelab"

What does XL mean?

XL as abbreviation means "X-axis of Spacelab"