texta
A coloured felt-tip pen, usually wide-tipped for use by children.
Here is what a wombat burrow may look like. Using coloured pencils or textas, colour in the wombat burrows.
Where it comes from
By trademark erosion from Texta, a registered trademark of Australian stationery company Jasco Pty Ltd. Presumably from text. Usage of the word began from the 1970s, when primary school children in Australia used the brand of felt-tip markers with bright, colourful packaging, prominently displaying the name "TEXTA".
Adapted from the Wiktionary entry texta (CC BY-SA 4.0).