The so-called VC (venture capital), seed investment round is generally round, angel round, A, B, C, D, E, F .... PE, Pre-IPO, but if the amount is not up to industry practices, such as a round of funding less than a standard round, but I'm bigger than the amount of angel round, will be called Pre-a. C round face in the same order of magnitude if the continuous melting of several funds and C rounds. It will be referred to as C1, C2, C3 so.