In Bag Pipe music the TACHUM is the description of a rhythm. It is most often used to describe the movement

• high G gracenote to C

However, it may also be applied to

• high G gracenote to B
• D gracenote to low A
• D gracenote to Low G

Orchestraly this rhythm is often referred to as a Scotch Snap.

Why tachum for a web page name? I like the sound and it is unique. It ties my piping into my web presence.