The ⚀trina·uncia·lengthel, or ⚀linial·length, or ⚀dermal·length
The ⚀trina·uncia·lengthel (abbreviated ⚀t•u↓lgℓ) is a quarter of a ⚀morsel·length or a dozenth of a ⚀thumb·length (very close to 2 millimeters). This is a fair approximation of the traditional "line" unit, which originally was a dozenth of an inch. As a consequence, a proposed colloquial name for this is the ⚀linial·length. It is also about the thickness of human skin, so another proposed colloquial is the ⚀dermal·length.