Given that "eptar" could be a misspelling or variation, it's possible that it refers to a tiling pattern related to or resembling known patterns:
If "eptar" relates to "heptagonal," it could refer to a tiling pattern involving heptagons (seven-sided polygons). However, a regular heptagonal tiling is not possible because the internal angle of a regular heptagon is not a divisor of 360 degrees in a way that allows for simple, gapless tiling with identical polygons. eptar tiling