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sub-contra octave
sub-contra octave n. 
/ˌsʌbˌkɒntrə ˈɒkteɪv/, /ˌsəbˌkɑntrə ˈɑkˌteɪv/
Brit. /ˌsʌbˌkɒntrə ˈɒktɪv/
, /ˌsʌbˌkɒntrə ˈɒktɪv//ˌsʌbˌkɒntrə ˈɒkteɪv/U.S. /ˌsəbˌkɑntrə ˈɑktəv/
, /ˌsəbˌkɑntrə ˈɑktəv//ˌsəbˌkɑntrə ˈɑkˌteɪv/ΚΠ
1876 Proc. Musical Assoc. (2nd Sess., 1875–6) 3 4C=16 vib means C in the Sub-Contra Octave, or double under-accented or under-lined Great Octave.
1956 H. Shanet Learn to read Music (new ed.) App. 168 For the extremely low notes of the Contra Octave and Sub-contra Octave, a similar method is used to avoid some of the leger lines.
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