For a correct Tifinagh font display, please install this IRCAM font.
Tifinagh on computers 
The IRCAM has launched a software suite that enables Windows XP users to be able to view/write Tifinagh on Windows machines. This suite can be downloaded from the IRCAM website download here.
It is possible to write Tifinagh on other systems as there are free Tifinagh fonts download here such as AFUS DEG WFUS developed by the Solidarité Berbèro-Européenne AFUS DEG WFUS.