Noun: Recognized or habitual exercise a particular exercise of very long standing cash gathered less than a tariff habitual patronage; "I have presented this tailor my custom for quite some time" convention�?多指约定俗成的行为方式规则或公认的标准，或指艺术上公认的技巧。 HSC LED is production led display in 2012 and custom led display due to the fact 2015. Now https://www.leddisplayfactory.com/