Open Word to a blank Landscape page, type the message, select Centre
alignment button on the Toolbar and in Page Setup set Centre for Vertical
alignment. Now select the text and use Ctrl+] to increase the font until the
desired size is reached. Not that symbols such as right/left/up/down arrows
can be found in the Symbols or Windings font sets.
Alternatively, you will find the most common international signs in the Clip
Art section - though it is quite beyond me why simple words such as 'Gents'
or 'Disabled' that sufficed for centuries should be changed for pictures of
a man or a wheelchair. Perhaps it is for the visually challenged.
Print.