Both, \r{A} and \AA (rsp. \r{a} and \aa) are equivalent standard LICR macros for Aring/aring as well as the deprecated "angstrom sign" character (212B).
However, with \AA for 212B and \r{A} for 00C5, tex2lyx converts \AA to the deprecated "angstrom sign" which is missing in many fonts including the Unicode version of Latin Modern. See also https://en.wikipedia.org/wiki/%C3%85#Symbol_for_.C3.A5ngstr.C3.B6m --- lib/unicodesymbols | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/unicodesymbols b/lib/unicodesymbols index ff53354..03b45e2 100644 --- a/lib/unicodesymbols +++ b/lib/unicodesymbols @@ -86,7 +86,7 @@ 0x00c2 "\\^{A}" "" "mathalpha" "\\hat{A}" # LATIN CAPITAL LETTER A WITH CIRCUMFLEX 0x00c3 "\\~{A}" "" "mathalpha" "\\tilde{A}" # LATIN CAPITAL LETTER A WITH TILDE 0x00c4 "\\\"{A}" "" "mathalpha" "\\ddot{A}" # LATIN CAPITAL LETTER A WITH DIAERESIS -0x00c5 "\\r{A}" "" "mathalpha" "\\mathring{A}" # LATIN CAPITAL LETTER A WITH RING ABOVE +0x00c5 "\\AA" "" "mathalpha" "\\mathring{A}" # LATIN CAPITAL LETTER A WITH RING ABOVE 0x00c6 "\\AE" "" "" # LATIN CAPITAL LETTER AE 0x00c7 "\\c{C}" "" "mathalpha" "\\cedilla{C}" "accents,cedilla" # LATIN CAPITAL LETTER C WITH CEDILLA 0x00c8 "\\`{E}" "" "mathalpha" "\\grave{E}" # LATIN CAPITAL LETTER E WITH GRAVE @@ -118,7 +118,7 @@ 0x00e2 "\\^{a}" "" "mathalpha" "\\hat{a}" # LATIN SMALL LETTER A WITH CIRCUMFLEX 0x00e3 "\\~{a}" "" "mathalpha" "\\tilde{a}" # LATIN SMALL LETTER A WITH TILDE 0x00e4 "\\\"{a}" "" "mathalpha" "\\ddot{a}" # LATIN SMALL LETTER A WITH DIAERESIS -0x00e5 "\\r{a}" "" "mathalpha" "\\mathring{a}" # LATIN SMALL LETTER A WITH RING ABOVE +0x00e5 "\\aa" "" "mathalpha" "\\mathring{a}" # LATIN SMALL LETTER A WITH RING ABOVE 0x00e6 "\\ae" "" "" # LATIN SMALL LETTER AE 0x00e7 "\\c{c}" "" "mathalpha" "\\cedilla{c}" "accents,cedilla" # LATIN SMALL LETTER C WITH CEDILLA 0x00e8 "\\`{e}" "" "mathalpha" "\\grave{e}" # LATIN SMALL LETTER E WITH GRAVE -- 2.5.1