Designation of Numbers in Framework Type Codes
The members of the Structure Commission have tried to rationalize the letter combinations that are used in framework type codes to designate numbers in new type materials. Wherever possible, combinations that have been used in the past have been retained (unless there are conflicts). The letters shown below will be used in all future code assignments.
1 O, ON 21 WO 41 RO 61 SO 81 EO 2 W 22 WW 42 RW 62 SW 82 EW 3 T 23 WT 43 RT 63 ST 83 ET 4 R 24 WR 44 RR 64 SR 84 ER 5 F, FI 25 WF 45 RF 65 SF 85 EF 6 S, SI 26 WS 46 RS 66 SS 86 ES 7 V, SV 27 WV 47 RV 67 SV 87 EV 8 E 28 WE 48 RE 68 SE 88 EE 9 N 29 WN 49 RN 69 SN 89 EN 10 OZ 30 TY 50 FY 70 VY 90 NY 11 EL 31 TO 51 FO 71 VO 91 NO 12 TL 32 TW 52 FW 72 VW 92 NW 13 TH 33 TT 53 FT 73 VT 93 NT 14 OR 34 TR 54 FR 74 VR 94 NR 15 OF 35 TF 55 FF 75 VF 95 NF 16 OS 36 TS 56 FS 76 VS 96 NS 17 OV 37 TV 57 FV 77 VV 97 NV 18 EI 38 TE 58 FE 78 VE 98 NE 19 NI 39 TN 59 FN 79 VN 99 NN 20 WY 40 RY 60 SY 80 EY 100 HD
last updated 17-May-2004