Invacare Mirage Operating Manual page 13

This symbol indicates the maximum width to which an armrest may be
adjusted. Pulling the armrest out further can cause it to fall out of it's
fixation. For further information, see chapter "Adjusting the width of the
armrests" on page 53.
If the power wheelchair is fitted with a table, it is
imperative that it is removed and safely stowed
when transporting the wheelchair in a vehicle!
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