Zero

0 is zero and in British English, it’s sometimes known as nought.
In telephone numbers, room numbers, bus numbers and dates (years), we say oh.
Here are some examples:

• The meeting is in Room 502 (five oh two)
• You need to take Bus 205 (two oh five)
• She was born in 1907 (nineteen oh seven)
• My telephone number is 07781 020 560 (oh double seven eight one oh two oh five six oh OR zero seven seven eight one zero two zero five six zero)

For football scores we say nil: ‘The score was three-nil (3-0) to Barcelona’.
American English uses various words for sports scores: The Yankees are winning three nothing/ three zero/ three zip.

For tennis scores we say love: ‘The score was thirty love. (30-0)
For temperatures we say zero: ‘It’s zero degrees celsius today (0°)
The decimal point (Notice that in English we say decimal point, and not a dot as in internet addresses). 

In British English, zero and nought are used before and after a decimal point. American English does not use nought.

Oh can be used after the decimal point.
Here are some examples:

• 0.05       zero point zero five OR nought point nought five
• 0.5%      zero point five per cent OR nought point five per cent.

• 0.501     zero point five zero one OR nought point five nought one OR           nought/zero point five oh one

NOTE: 0.6 = point six

                                                                                                                http://englishwithatwist.com/2013/04/09/how-to-say-zero-in-english/