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s-cis, s-trans

https://doi.org/10.1351/goldbook.S05508
The spatial arrangement of two conjugated double bonds about the intervening single bond is described as s-cis if synperiplanar and s-trans if antiperiplanar. This term should not be applied to other systems such as N-alkyl amides (use E/Z or sp/ap).
S05508.png
Source:
PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2217 (https://doi.org/10.1351/pac199668122193)