+118677 I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside but make the letters invisable! 
\boxed{\color{white}ABC}
\(\boxed{\color{white} ABC} \)
\boxed{\color{white}ABCDGFRE}
\(\boxed{\color{white}ABCDGFRE}\)
+9479 Another code I like to use to make things invisible is \phantom{}
It will makes whatever you put inside invisible! I sometimes use it for spacing
Also there is the \hspace command which can be used to make a horizontal space of a specified length.
For example, the code: a\hspace{3cm}b
makes this:
\(a\hspace{3cm}b\)
So there are 3 cm of space between the a and the b.
(Also here is a list of the different types of units of length it recognizes)
+9479 It looks like just making a box with the \hspace command makes a narrower box like this:
\(\boxed{\hspace{10cm}}\)
And I tried to use the \vspace command to make it taller but it seems like that doesn't work in math mode :\
+118677 Thanks Hectictar,
I really like that \phantom one !
And the \hspace{3cm}b looks like it would be really useful.
It is good to have seome more commands that actually do work here
I will add an a link to this thread, to the Latex thread that is found in the sticky notes.
