Engraving into timber can be done in two ways. We can laser engrave into the timber. Most of the time the engraving comes out as a branding burnt effect, like the kebab sign below. But this does depend on the type of timber used, as to how dark it actually comes out.
We can also engrave into the timber surface itself and [aint fill the lettering or leave ti natural. Both the supplied baby cot and road sign marker have been left natural.
Stencils can also be made from timber, like the one below.