In ordinary standard typing, I learned that there are 2 spaces after the period.
When people still learned how to type on manualtypewriters, the convention used to be two spaces after a period at the end of a sentence, and one space after a period after an abbreviation within a sentence.
In formal typesetting, however, the standard has alwaysbeen to use one space after a period. (Sometimes typesetters would use slightly wider spaces, but never two actual spaces.)
In modern keyboarding on computers with modern word processing software that approximates the look and feel of formal typesetting, it is also now standard to use only one space after a period--and this is how kids are taught to type nowadays as well. This standard has also been adopted by most style guides (e.g. Chicago Manual of Style, MLA, etc.).
A good rule of thumb, then, is that you should use one space after a period now--unless you are using a font like Courier that has the look of old manual typewriter print, in which case you have the option of using two spaces.
More important than the number of spaces, however, is consistency: if you choose to use two spaces after periods, that's perfectly fine so long as do that consistently throughout a given document.
Unlike the period at the end of a sentence (which have one or two spaces), the period following an abbreviation only needs one space. This is the general rule for abbreviations such as Dr., Jr., or Sr.
none
I've counted 166,324 words / 767,308 words (no spaces) / 941,019 (with spaces) / 4,973 paragraphs / 13,460 lines.
When using a semicolon you put one space after the semicolon.
The sonata have 4 classical period.
no spaces
2 Spaces
In typing, proper style is 2 spaces after a period (.), as well as after a colon (:).
It used to be 2 spaces but nowadays it is only 1.
one
2
2
one space after and abberviation two spaces at the end of a sentence
One space follows a period after an initial.
One.
1
How many spaces do you need after the word period? Is she having her period.