X

How to type it

Left ring finger; hold Shift for the capital. Introduced in Lesson 14: Bottom row: x and ..

Common uses

• X usually sounds like ks, as in box, and like z at the start of a word like xylophone.
• In algebra, x is the traditional name for an unknown quantity.

Less common uses

• X is the Roman numeral for 10.
• X is a human sex chromosome, paired with another X or a Y.
• Xmas uses X for the Greek letter chi, the first letter of Christ in Greek.