Card read as qiǎ, the original meaning is set up in the main traffic lanes of the inspection or tax collection, after the derivation of the meaning of the instrument to clip things, clamped in the middle, pressed, and other meanings, read as kǎ, meaning blocking or mechanical engineering special tools, etc..
The character for point, first seen in seal script, originally meant a spot, later derived to mean a stain, a small drop of liquid, to start a fire, a prescribed clock hour, a matter, a place, a degree, etc. In antiquity, nighttime timekeeping was done with a shifting point, e.g., at five o'clock and three o'clock.
Card point can be understood as the quasi-point, in the prescribed time, exactly at a specific time to arrive, not more than a minute, not less than a minute, in the production of the video, the card point is the basic requirements.