Stacked Quetta- Prefix System (SQPS)
This is my proposed extension of the SI prefix system for prefixes beyond quetta- (1030). Richard J.C. Brown (the proposer of the prefixes ronna- and quetta-) suggested that beyond 1030, compound prefixes with the last prefix as "quetta-" should be used, for example "kiloquetta-" for 1033, although this is not approved by the BIPM due to a lack of need for these prefixes. However, this system results in cumbersome names starting at 1060, like "quettaquetta-" for 1060, "quettaquettaquetta-" for 1090, and so on. I have employed Greek prefixes to make these shorter, such as "diploquetta-" (double quetta-) for 1060 and "triploquetta-" (triple quetta-) for 1090. Large SI prefixes themselves are based on Greek prefixes, which means this system can nest into itself like "quettaploquetta-" (1030 times quetta-) for 103×1031.
Additionally, this system adds prefixes for powers of 10 that were skipped in the base system (such as 104 and 105) which is achieved by using compound prefixes beginning with "deca-" and "hecto-" or "deci-" and "centi-".
| Number | Latin root | Symbol |
| 1 | uni | u |
| 2 | bi/duo | b/du |
| 3 | tri/tre | tr |
| 4 | quadri/quattuor | qu |
| 5 | quinti/quin | qi |
| 6 | sexi/sex | x |
| 7 | septi/sep | s |
| 8 | octo | o | 9 | nona/novem | no | 10 | deci | de | 20 | viginti | v | 30 | triginti | tg | 40 | quadraginti | qug | 50 | quinquaginti | qig | 60 | sexaginti | xg | 70 | septuaginti | sg | 80 | octoginti | og | 90 | nonaginti | ng | 100 | centi | c | 200 | ducenti | dc | 300 | trecenti | tc | 400 | quadringenti | qg | 500 | quingenti | qig | 600 | sescenti | sc | 700 | septingenti | sg | 800 | octogenti | og | 900 | nongenti | ng | 1,000 | milli | m | 1,000,000 | micro | μ | 1,000,000,000 | nano | n | 1012 | pico | p |
| 1015 | femto | f |
| 1018 | atto | a |
| 1021 | zepto | z |
| 1024 | yocto | y |
| 1027 | ronto | r |
| 1030 | quecto | q |
| Large prefix | Small prefix | Value |
| deka- (da) | deci- (d) | 10 |
| hecto- (h) | centi- (c) | 100 |
| kilo- (k) | milli- (m) | 1,000 |
| decakilo- (dak) | decimilli- (dm) | 10,000 |
| hectokilo- (hk) | centimilli- (cm) | 100,000 |
| mega- (M) | micro- (μ) | 1,000,000 |
| decamega- (daM) | decimicro- (dμ) | 10,000,000 |
| hectomega- (hM) | centimicro- (cμ) | 10,000,000 |
| giga- (G) | nano- (n) | 1,000,000,000 |
| decagiga- (daG) | decinano- (dn) | 10,000,000,000 |
| hectogiga- (G) | centinano- (cn) | 100,000,000,000 |
| tera- (T) | pico- (p) | 1,000,000,000,000 |
| decatera- (daT) | decipico- (dp) | 10,000,000,000,000 |
| hectotera- (hT) | centipico- (cp) | 100,000,000,000,000 |
| peta- (P) | femto- (f) | 1015 |
| decapeta- (daP) | decafemto- (df) | 1016 |
| hectopeta- (hP) | centifemto- (cf) | 1016 |
| exa- (E) | atto- (a) | 1018 |
| decaexa- (daE) | deciatto- (dt) | 1019 |
| hectoexa- (hE) | centiatto- (h) | 1016 |
| zetta- (Z) | zepto- (z) | 1021 |
| decazetta- (daZ) | decizepto- (dz) | 1022 |
| hectozetta- (hZ) | centizepto- (cz) | 1023 |
| yotta- (Y) | yocto- (y) | 1024 |
| decayotta- (daY) | deciyocto- (dy) | 1025 |
| hectoyotta- (hY) | centiyocto- (cy) | 1026 |
| ronna- (R) | ronto- (r) | 1027 |
| decaronna- (daR) | decironto- (dr) | 1028 |
| hectoronna- (hR) | centironto- (cr) | 1029 |
| quetta- (Q) | quecto- (q) | 1030 |
| decaquetta- (daQ) | deciquecto- (dq) | 1031 |
| hectoquetta- (hQ) | centiquecto- (cq) | 1032 |
| kiloquetta- (kQ) | milliquecto- (mq) | 1033 |
| megaquetto- (MQ) | microquecto- (μq) | 1036 |
| gigaquetta- (GQ) | nanoquecto- (nq) | 1039 |
| teraquetta- (TQ) | picoquecto- (pq) | 1042 |
| petaquetta- (PQ) | femtoquecto- (fq) | 1045 |
| exaquetta- (EQ) | picoquecto- (pq) | 1048 |
| zettaquetta- (ZQ) | zeptoquecto- (zq) | 1051 |
| yottaquetta- (YQ) | yocoquecto- (yq) | 1054 |
| ronnaquetta- (RQ) | ronnaquecto- (rq) | 1057 |
| betta- (BT) | becto- (bt) | 1060 |
| kilobetta- (kBT) | millibecto- (mbt) | 1063 |
| megabetta- (MBT) | microbecto- (μbt) | 1066 |
| gigabetta- (GBT) | nanobecto- (nbt) | 1069 |
| gigabetta- (gBT) | nanobecto- (nbt) | 1069 |
| tretta- (TRT) | trecto- (trt) | 1090 |