I think they could be considered either checkered or knurled. If you look up the definition of knurled it describes what we think of as checkering. I have a WWII 1911 that has what I think are original triggers faces like that and I've been told they were 'checkered'. Take your pick. I've knurled things I've made on a lathe. There's a special took with rollers that upset the metal into the diamond pattern. The more passes you make the more they become pointed diamonds. so maybe if the pattern is pressed in, it's knurling and if it's cut in it's checkering??
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