＃用英语怎么说就是手机上是“＃”“＊”,汉语叫井号,星号,英文怎么说?star还好理解，为什么叫sharp

参考：pound sign,
Prior to the introduction of the IBM PC there was no unique accepted standard for entering,displaying,printing,or storing the £ sign in the UK computer industry.On personal computers prior to the PC the "#" key was often used; sometimes it was displayed on screen as "#",but many printers could be set up to print "£" where "#" was sent to the printer by an application program.Keying in,storing,displaying,and printing the sign often required special setup.The "#" sign is sometimes called "pound sign" in non-sterling countries,possibly because UK-produced document files often included a character which displayed and printed the intended pound sign as "#" on non-UK equipment.
The PC UK keyboard layout has the "£" symbol on the 3 number key,where an American keyboard has the number sign ("#").
但 有人叫 hex sign
# 不是 sharp

# = sharp/number
* = star

# - hash
＊ Asterisk

# = sharp
* = star

*
asterisk
#
读法很多：
pound
pound sign
hash
number （sign）
sharp
（garden）fence
octothorp
括号内的单词可以省略。
http://blog.guoshuang.com/?p=6171