sq.

1. Sequens (Latin), following (pl sqq sequentes or sequentia)
2. (also Sq.) square or Square (in addresses)

• xiphopagous
• xiphopagus
• xiphophyllous
• Xiphosura
• xiphosuran
• xis
• XL
• Xm
• Xmas
• XML
• XMS
• Xn
• XNOR
• xoana
• xoanon
• XOR
• Xosa
• XP
• X-particle
• X-rated
• xray
• X-ray
• Xray
• X-ray astronomy
• X-ray crystallography