Do IC manufacturers enjoy torturing their customers?

[JoeO]

1 should have a slash through it?

I think they mean the hat/tick on the number 1.  As opposed to drawing it just as a stick.

Thank you.  That is exactly what I meant.

[TimFox]

I think that it is called a "serif".  When serifs are missing, the font is called "sans serif".
Many years ago, it was common to use lower-case "l" for "1", since typewriters did not have a number 1 key.

[CatalinaWOW]

It is time for the US to wake up and solve problems that others have solved years ago.

0(zero) should have a slash through it.
1(one) should have a slash through it.
7(seven) should have a slash through it.

4.7K should be 4K7.

4.7 ohms should be 4R7.

Is there any that I missed?

I like the Euro slash through zero, and have used it for years, as do some fonts.  But they don't have the only, or best solutions.  The slash through the 7 is to distinguish it from the euro handwritten 1 which has a distinct serif at the top.  Could be confused with a 7 in some handwritings.  But if you put a slash through both 1 and 7 you get confusion again.  Don't actually know any Europeans that add a slash to the 1.  The American 1 and a lower case L can be confused in some handwriting and some fonts, so the Euro serif has advantages, but careful handwriting and use of just about any font other than Courier solves the problem.  Substituting K and R for the decimal point (. or ,) adds confusion in some cases rather than removing it.

[JohnPen]

Back in the early days with s/w, f/w etc 'zero (0/O)' and 'I (l)' were avoided because of the possible confusion but  unfortunately they have found there way back into regular use!

[dom0]

It is time for the US to wake up and solve problems that others have solved years ago.

0(zero) should have a slash through it.
1(one) should have a slash through it.
7(seven) should have a slash through it.

4.7K should be 4K7.

4.7 ohms should be 4R7.

Is there any that I missed?

I like the Euro slash through zero, and have used it for years, as do some fonts.  But they don't have the only, or best solutions.  The slash through the 7 is to distinguish it from the euro handwritten 1 which has a distinct serif at the top.  Could be confused with a 7 in some handwritings.  But if you put a slash through both 1 and 7 you get confusion again.  Don't actually know any Europeans that add a slash to the 1.  The American 1 and a lower case L can be confused in some handwriting and some fonts, so the Euro serif has advantages, but careful handwriting and use of just about any font other than Courier solves the problem.  Substituting K and R for the decimal point (. or ,) adds confusion in some cases rather than removing it.

He didn't mean a slash through the 1, but it's "hat":

1 should have a slash through it?

I think they mean the hat/tick on the number 1.  As opposed to drawing it just as a stick.

Thank you.  That is exactly what I meant.