List of Keras string identifiers

I was looking for a list of Keras string identifiers. By string identifier, I mean string equivalent of Keras objects that one can pass to class constructors. As an example, if I want to use the He Normal initializer for a layer, I can do:

layer = tf.keras.layers.Dense(3, kernel_initializer="he_normal")

I could not find any list of such Identifiers in the official documentation. I found This Stackoverflow question, and it turns out the documentation does not cover this subject. If there is such a list of Keras string identifiers, please let me know; otherwise, I will open an issue about documentation in Github.