标志化石

最早骨骼生物Cloudina——埃迪卡拉纪晚期一类重要的标准化石

Index to Scientific & Technical Proceedings，ISTP

profitability index

nucleoplasmic index (Hertwig 1903)

steroid protein activity index

topological index

index of radical【数】;radical exponent【数】

nutrient index

index of coincidence