E̊ and e̊ not available. They are used in some dialects of Walloon and Picard.
Submitted by Jean-François Colson
Assigned to Xorg Project Team
In Walloonia, Nord-Pas-de-Calais and Picardy, the official language is French. But there are also local languages such as Walloon and Picard.
In some dialects of those two languages, the letter E with ring above is used. Nevertheless, it is not included in the ISO-8859-1 character set, and that's why you can find documents such as this version of the Universal Declaration of Human Rights in Picard (http://www.ohchr.org/EN/UDHR/Documents/UDHR_Translations/frn2.pdf) where “e̊” is replaced by “e°” and “E̊”, by “E°”.
In order to diminish the need for such a surrogate, it would be wise to add the next two lines into the file /usr/share/X11/locale/en_US.UTF-8/Compose:
<E> : "E̊" # LATIN CAPITAL LETTER E WITH COMBINING RING ABOVE
<e> : "e̊" # LATIN SMALL LETTER E WITH COMBINING RING ABOVE