With electronics, there's connections, which usually means sockets and pins.
To help you out is our Fpin3. That's our way of saying it is a socket (female), 3-position long strip. This is the default size, on 0.1" spaced centers.

• Type: Female (sockets)
• Positions: 3
• Spacing: 0.1"
• Gold Flash finish
• Standard pin length for PCB soldering

• [Data Sheet]: FPin Socket datasheet