I use it alot here in US. ex. this car have 50K miles sell for 30K. US don't use name for 10,000 (MEEARN) or 100,000 (SAARN). They call 10 thousand and 100 thousand so 10K or 10 grand and 100K or 100 grand seem reasonable and easy. But in Thai we have name for it so why not using it. FA RUNG JA wanna be ;D