Certain fire-making methods rely of the presence of a board to help create the coal. These include bow-drill, hand-drill, and pump-drill. These methods utilize a spindle which is spun in a socket on a board of some sort.

Bow Drill Fireboards
by Allan "Bow" Beauchamp
Fungus Fireboard
by Allan "Bow" Beauchamp
Bow Boards
An exploration of various methods of making fire boards - by Allan "Bow" Beauchamp
Bow's Blindfolded Fireboard
Could you make a fireboard and fire in the dark? - by Allan "Bow" Beauchamp

Here is a fireboard made from two sticks bound together. The crack makes a notch in which to catch the dust and coal.

Survival Fire Bowdrill Handdrill Pumpdrill Fireboards

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