e numeral "oh."
That's a 0 (zero) too, for C0G and not COG. This derives from EIA RS-198. T he letter C means significant digit of tempco in ppm/oK is 0.0, the second code is always numeric is multiplier for tempco designated by first code an d 0 means x1, the third G means tolerance of tempco in the ppm/oK with G de signating +/-30.