diff --git a/multiperspective/symbolic.ttl b/multiperspective/symbolic.ttl
index 80a2124a..3943e7e7 100644
--- a/multiperspective/symbolic.ttl
+++ b/multiperspective/symbolic.ttl
@@ -29,6 +29,7 @@ The symbolic module includes symbols, symbolic constructs and formal languages."
                                                    owl:versionInfo "1.0.0-rc1" ;
                                                    :EMMO_1246b120_abbe_4840_b0f8_3e4348b24a17 "emmo@emmc.eu" .
 
+
 #################################################################
 #    Datatypes
 #################################################################
@@ -153,7 +154,7 @@ The `hasPart` relation can be used to refer to the scalar data"""@en .
                                                                  owl:onProperty :EMMO_b6292331_94af_4f00_976b_ea55960c2f1c ;
                                                                  owl:someValuesFrom owl:real
                                                                ] ;
-                                           rdfs:subClassOf :EMMO_8b305b63_6fa3_44dd_9679_17eb8403a07a ;
+                                           rdfs:subClassOf :EMMO_4ca129f3_5341_4dbf_b081_bbe0df9d081a ;
                                            skos:prefLabel "RealData"@en ;
                                            :EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "A data representing a real number."@en .
 
@@ -370,7 +371,9 @@ If an 'interpreter' skilled in english language is involved in a 'semiotic' proc
 :EMMO_88a34881_b8d0_474b_9a08_40dbd414d834 rdf:type owl:Class ;
                                            rdfs:subClassOf :EMMO_8b305b63_6fa3_44dd_9679_17eb8403a07a ;
                                            skos:prefLabel "FloatingPointData"@en ;
-                                           :EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "A symbolic data representing a numerical floating point value."@en .
+                                           :EMMO_c7b62dd7_063a_4c2a_8504_42f7264ba83f "Floating points are defined in the ANSI/IEEE Standard 754-1985 for Binary Floating-Point Arithmetic."@en ;
+                                           :EMMO_c84c6752_6d64_48cc_9500_e54a3c34898d "A numerical data representing a generic floating point number following the IEEE 754 standard."@en ,
+                                                                                      "https://en.wikipedia.org/wiki/IEEE_754"^^xsd:anyURI .
 
 
 ###  https://w3id.org/emmo#EMMO_89a0c87c_0804_4013_937a_6fe234d9499c
@@ -584,4 +587,19 @@ Symbols of a formal language must be capable of being specified without any refe
                                            :EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "A data representing an arbritrary sized integer number."@en .
 
 
+###  https://w3id.org/emmo/multiperspective/symbolic#EMMO_4ca129f3_5341_4dbf_b081_bbe0df9d081a
+:EMMO_4ca129f3_5341_4dbf_b081_bbe0df9d081a rdf:type owl:Class ;
+                                           rdfs:subClassOf :EMMO_8b305b63_6fa3_44dd_9679_17eb8403a07a ;
+                                           skos:prefLabel "ComplexData"@en ;
+                                           :EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "A numerical data representing a complex number."@en ;
+                                           :EMMO_c7b62dd7_063a_4c2a_8504_42f7264ba83f "Complex numbers may be represented in different ways, e.g. as real and imaginary parts or as with radial coordinates with radius and angle."@en .
+
+
+###  https://w3id.org/emmo/multiperspective/symbolic#EMMO_ba65b982_6f48_479a_a326_0b50fdc433de
+:EMMO_ba65b982_6f48_479a_a326_0b50fdc433de rdf:type owl:Class ;
+                                           rdfs:subClassOf :EMMO_4ca129f3_5341_4dbf_b081_bbe0df9d081a ;
+                                           skos:prefLabel "ImarginaryData"@en ;
+                                           :EMMO_967080e5_2f42_4eb2_a3a9_c58143e835f9 "A numerical data representing an imaginary number."@en .
+
+
 ###  Generated by the OWL API (version 4.5.26.2023-07-17T20:34:13Z) https://github.com/owlcs/owlapi