Twin vs Qi

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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a singleton, and the general term for one offspring of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgangers.

Source: Wikipedia

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In traditional Chinese culture, qi or ch'i ( CHEE simplified Chinese: 气; traditional Chinese: 氣; pinyin: qì qì) is believed to be a vital force forming part of any living entity. Qi translates as "air" and figuratively as "material energy", "life force", or "energy flow". Qi is the central underlying principle in Chinese traditional medicine and in Chinese martial arts.

The practice of cultivating and balancing qi is called qigong. Believers of qi describe it as a vital force, the flow of which must be unimpeded for health. Qi is a pseudoscientific, unverified concept, which has never been directly observed, and is unrelated to the concept of energy used in science (vital energy itself being an abandoned scientific notion).

Source: Wikipedia