Salaams All ~ Please note the more accurate letters represented as 
 A 5 1 U U A 
I puzzle as to the language. Is it an unrelated fact that this weapon is said to have been purchased in Yemen ...is the star shape a red herring since it seems to be part of an elongated tang...or...?
We have a series of letters that look like 
A 5 1 U U A Not English but Latin or Greek or.... ?
Taking each letter one by one;
A ...Perhaps Not an 
A  but possibly since there is one at each end of the letters some sort of brackets in which the saying is placed possibly a holy incantation thus what appears to be crown shaped A at each end...I pencil in 
Crown A Shapes..
5 ...not a full 5...the top is missing. Is this a figure 3(Gimmel) in Hebrew ... ? Or is it the much more interesting Zayin in Hebrew...In its cursive form? Which means a number of different concepts/things including the number 7. It also stands for Jesus combined with the Holy Spirit...and interestingly enough a weapon or sword. 
I ...see below. As a number its a 
6
 U U  ..each looks like an inside out 
u  As a number it is 9....so we have 
 9 9 
It appears to read from the left 
 A 7 6 9 9 A where the A are crowns? and where there is also a possibility that the fig 7 could be something entirely different ! 
Note. see 
http://www.hebrew4christians.com/Gra...yin/zayin.html
see 
https://www.pinterest.com/pin/167759154844035074/ for more numerical/letter clues.
Regards,
Ibrahiim al Balooshi.